What is DeFi (decentralized finance)?
In one line: DeFi, short for decentralized finance, means financial apps such as trading, lending and borrowing that run on a blockchain through code instead of a bank or broker.
How it works
DeFi apps run on "smart contracts": programs stored on a Blockchain, usually Ethereum or a similar network. You connect your own Crypto wallet, and the code does the rest. No account sign-up, no bank.
Common uses:
- Swapping one token for another on a decentralized exchange (DEX).
- Lending coins out to earn interest.
- Borrowing against coins you lock up as collateral.
A simple example
You swap $1,000 of ETH for a Stablecoin on a DEX.
- The pool charges a 0.3% fee: $3.
- The network charges a fee, called Gas fees: say $4 (it varies a lot).
- The price moves a little against you while the swap fills, called Slippage: say 0.2%, or $2.
Total cost: about $9, or 0.9%. Example numbers only. Your wallet shows the real ones before you confirm.
Why it matters
DeFi shows what blockchains can do beyond sending coins. It's open to anyone with a wallet, around the clock.
But the safety nets of normal finance aren't there. No FDIC insurance, no SIPC protection, and often no one to call. If code has a bug or a project is a scam, money can be gone in minutes.
Common risks and safety tips
- Smart contract bugs and hacks. Even well-known apps have lost funds to exploits.
- Scams and rug pulls. A team can drain a project and vanish. See Rug pull.
- Liquidation. Borrowing against crypto means a sharp price drop can sell your collateral automatically.
- Fake sites. Bookmark the real address. Never approve a transaction you don't understand.
Very high advertised yields are a warning sign, not a feature. Ask where the yield really comes from.
More on the basics in crypto trading for beginners.
Questions
Is DeFi legal in the US?
Using DeFi apps isn't illegal in itself, but rules are still being worked out and some projects have faced enforcement. Taxes still apply.
Is DeFi safe?
It carries real risks: bugs, hacks, scams and price swings. Many people only use small amounts they can afford to lose.
What's the difference between DeFi and a crypto exchange?
A regular exchange is a company that holds your coins. DeFi apps are code you use from your own wallet.
Want the next step? We'll walk you through it.
Four free lessons by email, one every few days — each with a 10-minute exercise on a real chart.
Send Me the Free Lessons 4 short emails · No spam · Unsubscribe anytimeOr see the whole method, step by step:
See What’s Inside the Course Try everything free first. Decide when you're ready. · Open the free chart tool (works in the TradingView phone app)One chart idea a day, in plain English. Follow along: